Dredge-tumbler.



M. F. APGAR & 0. B. ANDREWS.

DREDGE TUMBLER.

I APPLICATION FILED 0CT;5.19I7.

1,27 1,990. Patented July 9,1918.

m U m.

H W Q 1 UNITED STATES PATENT ()FFICE.

MARSHALL F. APGAR AND CHARLES B. ANDREWS, OF HIGH BRIDGE, NEW JERSEY,ASSIGNORS T TAYLOR-WHARTON IRON & STEEL 00., OF HIGH BRIDGE, NEW JERSEY,A CORPORATIONOF NEW JERSEY. V

DREDGE -TUMBLER.

Specification of Letters Patent.

Patented J my 9, 1918.

Application filed October 5, 1917. Serial No. 194,921.

To all whom it may concern:

Be it known that we, MARSHALL F. APGAR and CHARLES B. ANDREWS, citizensof the United States, both residing in High Bridge, New Jersey, haveinvented the following-described Improvements in Dredge-Tumblers.

This invention is an improved pulley of a type commonly known as atumbler adapted for use in a dredging machine asthe lower support forthe endless bucket carrier. In

the manufacture and use of large dredges,

many difficulties are encountered in connection with the tumbler, dueprimarily to the exacting requirements and conditions of their use. Inorder to support the large loads 'carried'by the buckets, resistabrasion by the sand, stones and water in which the tumblerworks, andpermit of rapid and easy raising and swinging of the parts while inoperation, a tumbler of large diameter, great strength, extreme hardnessand the least possible weight is required.

The object of our invention is to secure these various desirableattributes in a simple construction of great strength and which isparticularly and specially suited for casting out of manganese steel andfor the subsequent necessary heat treatment. One embodiment of ourinvention is illustrated in the accompanying drawings although itwill beevident that our invention may take various other forms. In thesedrawings,

Figure 1 is an end view of a tumbler embodying our invention, a portionthereof being shown in transverse section;

Fig. 2 is a longitudinal section on the line II-II of Fig. 1, and

Fig. 3 is a sectional detail on the line IIIIII of Fig. 1.

The main portions of the tumbler are formed from a single casting ofmanganese steel or other suitable material and include a hub 10, aperipheral tread wall 11 and connections in the form of substantiallyparallel end walls 12 which extend outwardly beyond the peripheral wall11 as shroud flanges 13 In casting the end walls 12 a series ofcomparatively large openings 15 are formed, spaced apart to leavespokes, ribs, or other connecting means 16' extending from the hub tothe ends of the peripheral wall '11. The openings serve for the supportof the cores during casting and are comparatively large to facilitatethe removal of the cores as well as the circulation of water during heattreatment. To reinforce the end walls, to prevent admission of water orother material to the interior chamber, and to present substantiallyflush or smooth outer surfaces which will interfere as little aspossible with the rotation of the tumbler in the material in which thelatter works, each of said openings is provided with a closure plate 17which is permanently andhermetically secured therein. Each closure plateis -molten metal is introduced in a special machine and permitted toharden so as to form a permanent retaining ring 19. The introduction ofsuch metal is accomplished by means of the electric welding or similarprocess and results in the formation of a ring-like scam, the introducedmetal thereof adhering to the sides of the crevice. The shoulder 18prevents the metal from flowing into the interior of the tumbler. Thecrev ice extends inwardly to the shoulder 18 and its opposite side wallsformed by the wall of the opening and the periphery of the closure ispreferably so formed as to give an effective anchorage for thecast-inplace retaining ring. The preferred way is to undercut ordove-tail the wall of the opening above the shoulder and to bevelcorrespondingly the periphery of the closure, the latter being of suchsize as to pass through and leave the two proximate edge surfaces spacedapart and inclined in about the same general direction. The ring thusprevents outward movement of the closure and is itself prevented fromoutward movement by the dove-tail formation. In this manner,

metal and held by the cast-in-place retaining rings; aid materially inreinforcing the en tire construction.

The tumbler may be secured upon its shaft 'in 'any suitable' manner,such for instance as by keys engaging with key-ways which may haveliners 21 of softer metal 1 t ele ein- Th shaf which i iihQW l in let-telines i away he upported a itehy th par ll n mbe s f th hoem wh h l adjaen e th end walls 12 o the tumhle q .W'e. elaim A. .Wmh erl a ng huhporti n, a peripheral-Wal and pa ed .eenne ting m m here a eaetihtegraha le ur P ate a onneei e .end enheta t a ly filling th p e i hetw en-vadja ent Y e neeting m an bu eav ng revieeelong the dg an amemher Wel edin pla n sai r ice for permanentlyizeta hihg-e d ele u P ates.

v A tumbl having a m body including a hu end wa l e h having an peningther in and a p pheral wall betweehi aidend wa l nd f a len diameh rthan the e ter t leave a a nul r grqevle 1?channel,.cl u eier h openingsn; said endur 51 ea h sai openings pre ent nge hel lde here up n whichthe closure may seat, theperipheral surface of ea dl eeure being spa edf om the opp sed va the W l ea the op n ng, and a 5 ing: We de i placebetw en. a

anchored to, said surfaces.

Gene -Lei fie l t may be r ee ei- 3. A device of the clsss described,includ- 'i'ng a'hub, a peripheral Wall presenting out- \vardlyextending, 'stibstar'i'ti'ally parallel terminal flanges and spokesconnecting said periphera-liva-ll and said hub; each of said openingshaving an outwardly facing seat orshofilder therein, and an undercutportion between said shoulder and the outer surface,'a'clo'sure disposedWithin each opening and in, engagement, with the seat or shoulderthereof, and having its peripheral surface outwardly beveled and spacedfrom said undercut nentien, and retain ng ring wel ed pla wi hi th pacebet ee the bev led p riphery of the l sur and the ndercu leu z aeei .i-,A 1 ,a zti l o anufa reh ing he ly neetiene ormed o a single piece feast metaand in u ing- ;pe ;ip era vra1.1, hub an spa e ra a ly e t h 11g;, .he1ln he eennee ing the t r and mean for elee ing the. spac sbetween s d; me ber o, mm a el sed hellow chamber within s id bedy,. aid .1eane in lud ng: lee re p at ha ng their tersu c-z aeeed p sed. su

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